CN206096429U - Digital electric energy meter field calibration instrument based on radio communication technique - Google Patents

Abstract

A digital electric energy meter field calibrator based on wireless communication technology, including voltage transformers and current transformers, the voltage transformers and current transformers are used to obtain standard voltage signals and current signals, and the voltage transformers and current transformers are Connect the signal acquisition unit, the signal acquisition unit is connected to the digital electric energy meter, the electric energy pulse of the digital electric energy meter is transmitted to the signal acquisition unit, the digital electric energy meter is connected to the mobile phone client through the wireless transmission module, and the electric energy pulse of the digital electric energy meter is processed by the wireless The transmission module transmits to the mobile phone client. The utility model is a digital electric energy meter on-site calibration instrument based on wireless communication technology, which can carry out on-site calibration of digital electric energy meters through a mobile phone client calibration platform, and has the characteristics of small size, light weight and convenient operation.

Description

A digital electric energy meter field calibrator based on wireless communication technology

technical field

The utility model relates to the field of power system measurement, in particular to a field calibrator for digital electric energy meters based on wireless communication technology.

Background technique

The digital energy meter refers to following the IEC 61850-9-1 or IEC 61850-9-2 (LE) digital substation communication protocol and the IEC 60044-7/8 electronic transformer standard, adopting the port mode of optical fiber Ethernet, and applied to intelligent New energy meters in substations. With the development of smart substations and the popularization of digital energy meters, traditional analog input energy meters cannot meet the current technical requirements. In order to ensure the accuracy of electric energy measurement, high-efficiency, high-precision digital electric energy meter field calibrator is the inevitable trend of the current electric energy meter development.

The digitally collected data of the digital electric energy meter on-site calibrator can be transmitted from the signal acquisition unit through communication. The collection frequency is high and constant, and frequency tracking is not performed. It can be used by various smart devices. At present, domestic devices and technologies for high-precision on-site calibration of digital energy meters are still in their infancy, and the error of digital energy meters can only be verified through a system composed of notebooks, industrial computers, boards and other hardware, such as the Chinese patent " Multi-position digital electric energy meter calibrator (CN102928805A)", Chinese patent "a portable electric energy meter on-site calibration system (CN105223536A)", etc. It is neither convenient nor beautiful during on-site operation, which is not conducive to popularization and application of digital electric energy meter on-site calibrator.

Contents of the invention

Aiming at the shortcomings of the above-mentioned digital electric energy meter calibrator, the utility model proposes a digital electric energy meter on-site calibrator based on wireless communication technology, which can perform on-site calibration on the digital electric energy meter through the mobile client verification platform. It has the characteristics of small size, light weight and convenient operation. Based on the support of the signal acquisition unit and the wireless transmission module, the analog signal of the voltage and current can be digitized on the spot, converted into a suitable signal and transmitted to the remote mobile phone client through the wireless network together with the synchronously collected power pulse data, using data sharing and High-precision real-time sampling values are used to verify the energy meter.

The technical scheme that the utility model takes is:

A digital electric energy meter field calibrator based on wireless communication technology, including voltage transformers and current transformers, the voltage transformers and current transformers are used to obtain standard voltage signals and current signals, and the voltage transformers and current transformers are Connect the signal acquisition unit, the signal acquisition unit is connected to the digital electric energy meter, the electric energy pulse of the digital electric energy meter is transmitted to the signal acquisition unit, the digital electric energy meter is connected to the mobile phone client through the wireless transmission module, and the electric energy pulse of the digital electric energy meter is processed by the wireless The transmission module transmits to the mobile phone client.

Described signal acquisition unit comprises amplifier, filter circuit, A/D conversion module, ARM9 core processor, and voltage signal, current signal pass through amplifier, filter circuit, A/D conversion module and ARM9 processor successively, pass through wireless transmission module again The processed data signal is transmitted to the mobile client; the mobile client is used for parameter setting, analysis and calculation, and data recording.

The ARM9 core processor can control the signal acquisition of the voltage sensor and current sensor, and receive the output energy pulse of the watt-hour meter to be calibrated. It has the characteristics of low power consumption, low cost and high performance, and can well meet the needs.

The voltage transformer is a capacitive voltage divider with an open structure, including a low-voltage arm capacitor and a high-voltage arm capacitor, and is used to convert the 57.7V voltage supplied by the voltage transformer into a standard 4V voltage signal required by the signal acquisition unit.

The current transformer is an open structure with a rated output current of 100mA; the current transformer is connected to a 40Ω sampling resistor to convert the 5A current signal supplied by the current transformer into a standard 4V voltage signal required by the signal acquisition unit.

The wireless transmission module is IoT-9608I-L network controller. The network controller has a pre-installed mature Linux operating system, which can be freely matched with a variety of near-distance wireless communication modules (optional 2G/3G/4G/zigbee/RFID), with 8 channels of TTL level (8 channels of RS- 485 or 232), supports a variety of system functions, and has the characteristics of fast data transmission speed, good signal, small size, high flexibility and high cost performance.

The mobile client is a mobile APP based on the AppCan mobile application development platform, which can be connected to a designated local area network, and has the characteristics of complete and clear functions, simple and smooth operation. The data of the signal acquisition unit can be received in real time to achieve the purpose of information processing and control.

The utility model is a digital electric energy meter field calibrator based on wireless communication technology, which has the following beneficial effects:

1) The standard voltage and current sensors used in this utility model adopt an open structure, wherein the standard voltage sensor includes a low-voltage arm capacitor and a high-voltage arm capacitor. The structure is simple and easy to manufacture. When measuring, the standard voltage and current sensors can be directly clamped on the measured wires, and it has the characteristics of anti-interference and convenient operation during calibration.

2), the signal acquisition unit that the utility model adopts is through sampling on the spot in real time. The processed data signal is transmitted to the remote mobile phone client through the wireless transmission module. The information acquisition unit realizes multiple functions such as data sharing, analysis, control, and storage. It has the characteristics of real-time and accurate detection, and simple and convenient operation.

3) The utility model adopts the mobile phone client instead of the hardware system platform, which is small in size and light in weight, and can satisfy multiple calibration personnel to operate the system at the same time. You only need to download the APP on the mobile phone and connect to the designated local area network to directly monitor the operating system. Calibration of electric energy meters to meet the needs of the current rapid development of the network.

Description of drawings

Fig. 1 is a schematic diagram of module connection of the present invention.

detailed description

As shown in Figure 1, a digital electric energy meter field calibrator based on wireless communication technology includes a voltage transformer and a current transformer, and the voltage transformer and the current transformer are used to obtain standard voltage signals and current signals. Both the current transformer and the current transformer are connected to the signal acquisition unit, the signal acquisition unit is connected to the digital electric energy meter, the electric energy pulse of the digital electric energy meter is transmitted to the signal acquisition unit, the digital electric energy meter is connected to the mobile phone client through the wireless transmission module, and the electric energy pulse of the digital electric energy meter After processing, it is transmitted to the mobile phone client by the wireless transmission module.

Described signal acquisition unit comprises amplifier, filter circuit, A/D conversion module, ARM9 core processor, and voltage signal, current signal pass through amplifier, filter circuit, A/D conversion module and ARM9 processor successively, pass through wireless transmission module again The processed data signal is transmitted to the mobile client; the mobile client is used for parameter setting, analysis and calculation, and data recording.

ARM9 processor (S3C2440AL-40) is a 32-bit CMOS microcontroller developed by South Korea's Samsung. The ARM9 core processor can control the signal acquisition of the voltage sensor and current sensor, and receive the output energy pulse of the watt-hour meter to be calibrated. It has the characteristics of low power consumption, low cost and high performance, and can well meet the needs.

The standard voltage sensor used in the utility model is a capacitive voltage divider with an open structure, including a low-voltage arm capacitor and a high-voltage arm capacitor, and is used to convert the 57.7V voltage supplied by the voltage transformer into the required standard for the signal acquisition unit. 4V voltage signal.

The current transformer used in the utility model borrows from the patent (CN105223536A), and is also an open structure, which can be directly clamped on the measured primary current wire during measurement. The rated output current is 100mA; the current transformer is connected to a 40Ω sampling resistor to convert the 5A current signal supplied by the current transformer into the standard 4V voltage signal required by the signal acquisition unit.

The wireless transmission module is IoT-9608I-L network controller. The network controller has a pre-installed mature Linux operating system, which can be freely matched with a variety of near-distance wireless communication modules (optional 2G/3G/4G/zigbee/RFID), with 8 channels of TTL level (8 channels of RS- 485 or 232), supports a variety of system functions, and has the characteristics of fast data transmission speed, good signal, small size, high flexibility and high cost performance.

The mobile client is a mobile APP based on the AppCan mobile application development platform, which can be connected to a designated local area network, and has the characteristics of complete and clear functions, simple and smooth operation. The data of the signal acquisition unit can be received in real time to achieve the purpose of information processing and control.

The utility model provides a digital electric energy meter on-site calibrator based on wireless communication technology, through optimized standard voltage and current sensors, based on more accurate real-time sampling data, the data signal, electric energy pulse After processing, it is transmitted to the remote mobile phone client through the wireless transmission module. Compared with the traditional hardware system platform, the mobile client verification platform can satisfy multiple verification personnel for system operation at the same time, and is small in size, light in weight, easy to implement, Reliable performance, capable of real-time online monitoring of equipment data, has high application and promotion value.

Claims (5)

1. A digital electric energy meter field calibrator based on wireless communication technology, comprising voltage transformer, current transformer, voltage transformer, current transformer is used to obtain standard voltage signal, current signal, it is characterized in that: described voltage transformer Both the current transformer and the current transformer are connected to the signal acquisition unit, the signal acquisition unit is connected to the digital electric energy meter, the electric energy pulse of the digital electric energy meter is transmitted to the signal acquisition unit, the digital electric energy meter is connected to the mobile phone client through the wireless transmission module, and the electric energy pulse of the digital electric energy meter After processing, it is transmitted to the mobile phone client by the wireless transmission module. 2. According to claim 1, a digital electric energy meter field calibrator based on wireless communication technology is characterized in that: the signal acquisition unit includes an amplifier, a filter circuit, an A/D conversion module, an ARM9 core processor, and a voltage The signal and current signal pass through the amplifier, filter circuit, A/D conversion module and ARM9 processor in turn, and then transmit the processed data signal to the mobile client through the wireless transmission module; the mobile client is used for parameter setting, analysis and calculation, data record. 3. A digital electric energy meter field calibrator based on wireless communication technology according to claim 1, characterized in that: the voltage transformer is a capacitive voltage divider with an open structure, including low-voltage arm capacitance, high-voltage The arm capacitor is used to convert the 57.7V voltage supplied by the voltage transformer into the standard 4V voltage signal required by the signal acquisition unit. 4. A digital electric energy meter field calibrator based on wireless communication technology according to claim 1, characterized in that: the current transformer is an open structure, the rated output current is 100mA; the current transformer is connected to a 40Ω The sampling resistor converts the 5A current signal supplied by the current transformer into the standard 4V voltage signal required by the signal acquisition unit. 5. A digital electric energy meter field calibrator based on wireless communication technology according to claim 1 or 2, characterized in that: the wireless transmission module is an IoT-9608I-L network controller.